You can become a more technical wrestler at any age, if you teach them technical moves. If you want them to win at 6U, teach them a headlock, they'll win most of their matches, and intimidate other 6u kids with it. But then most kids will rely on that move, and when they start getting their tails handed to them at 8u, 10u, etc., they quit the sport. I think it is a move that kids should learn when they start FS/Greco, AFTER they have learned several leg attacks, a standup, and some riding/pinning combinations from the top.